PETS-2语法讲解(33)
'不定式的特殊句型so as to 1) 表示目的;它的否定式是so as not to do。Tom kept quiet about the accident so as not to lose his job.汤姆对事故保持沉默是为了不丢掉他的工作。Go in quietly so as not to...'
PETS-2语法讲解(31)
'省to 的动词不定式 1) 情态动词 ( 除ought 外,ought to):2) 使役动词 let, have, make:3) 感官动词 see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等后作宾补,省略to。 ...'
PETS-2语法讲解(29)
'一般现在时的用法 1) 经常性或习惯性的动作,常与表示频腮度的时间状语连用。时间状语:every…, sometimes, at…, on SundayI leave home for school at 7 every morning. 2) 客观真理,客观存在,科学事实...'